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Mitosis and Amitosis of Generative Cell Nuclei in Artificially Germinated Pollen Tubes in Zephyranthes candida(Lindl.)Herb. DYNAMIC CHANGES OF THE GENERATIVE CELL AND THE VEGETATIVE NUCLEUS IN ARTIFFICIALLY GERMINATED POLLEN TUBE IN LIRIOPE SPICATA LOUR THE FIBRILLAR INCLUSIONS IN THE VEGETATIVE NUCLEUS OF AMARYLLIS POLLEN TUBE *